Combination fluid and vacuum check.



T, GAST., COEHNATON 'FLUID AND VACUUM GEECK,

PLIATIGN FILED MAILZQ, 1909.

ja'enter Dec. 14;, 1909.

HARRY 'I'. CASE, .0F FRANKLIN, PENNSYLVANA.

I COMBINATION FLUID AND VACUUM CHECK,

Specication of Letters -Patent.

Patented Dee. M, MMM?.

Application led March 29, 1909. Serial No. 486,503.

To all whom 'it may concern.' y

Be it known that I, HARRY T. CASE, a citizen ot the United States, residing at Franklin, in the county ot' Venango and State et lennsylvania` have invented a certain new and useful Improvement in Combination Fluid and Vacuum Checks, of which the following is a full, clear, and exact description.

The object ot this invention is to provide means for controlling the flow of fluids in Isuch situations as pipe lines for transporting oil from oil tanks, and where the fluid is -arried through pipes, and it is desirable to maintain a vacuum in the pipes.

The invention consists in what, t'or want otl a better name, malv be called a co1nbination check valve, arranged in the outflow pipe ota tank or other vessel, in connection with any suitable stop-cock or other valve, so that where several of these tanks or other receptacles or reservoirs are connected on the. same main line, and are arranged at dit'- t'ercntaltitudes, the overflow on the lower tanks will be prevented automatically, The check valve comprises an ordinary flap or check operating on one pipe and a ball valve, on another pipe, a flap or check valve and a hall valve contained in a single casing being arranged in conjunction with each tank or other receptacle.

ln the accompanying drawings, illustrating the invention, in the several figures of which like parts are similarly designated, Figure l is a somewhat conventional elef'ation and partial section showing one tank at. one elevation and another tank at a lower elevation, with interposed outlet pipes containing a plug or other stop cock t'or each tank, and thc combination check valves, and both tanks connected with a main line. Fig. 2 is a loiigitudinal section, on a larger scale, ot' a combination check valve suitable for the purposes ot this invention, the valves heilig shown open in tnll lines and closed in dotted lines.

'l may represent an oil tank, or other receptacle or reservoir t'or the Huid to be moved, and 2 another such tank or reservoir arranged at a lower level.

3 is the main or transportation pipe, andy 4 and 5 are outlet pipes connecting these tanks with the main. lu each outlet pipe is a plug or other valve or stop cock, (l and 7, and interposed in these outletpipes are the combination check valves S `and f).

nasn'iuch as the combination check-valves are alike, and beth are represented in Fig. 2, a description ot one will suitice for all. Each combination check valve comprises casing l0, which may be i. casting, in the form of a` tee, having its three nipples internally screwthreaded. One nipple receives the horizontal portieri ot the outlet pipe and another ot these nipples receives the Vertical portion ot the outlet pipe, and these two portions of the pipe are roamed out. internally on a bevel. The other vnipple receives the closing plug ll which is hollowed out on the inside. l or 5, is arranged a tapered valve seat l2, which carries the lia p valve 13 hinged thereto at its upper end and seating on the mouth of the valve seat. The other pipe receives a tapered valve seat lllwhieh. receives the ballV valve 15.

By providing tapered valve seats, the construction is simplified, as is also the assembling of the parts, and their repair.

W hen the 'alve, for instance the valve (l, is opened, the weight and pressure ot the fluid in the tank will automatically open the liap valve 123, and the relation ot the flap valve to the hall valve is sach that when the flap valve starts to open, it will force the ball valve ott ot' its seat, and the fluid will then flow toward the main; and this position ot parts will be maintained until the tank is empty, or the valve 6 closed. ll'hcn this occurs the tlap valve falls back in place against its seat and allows the hall valve to roll back on its seat, thereby retaining the vacuum in the pipe line and preventing' said pipe linel from being sucked full ot' air.

The llap valve in addition to pushing9 the ballvalve ott ot` its seat in its action also serves as a check valve against fluid backing up into the tank and overflowing it in ease of the higher ta'nk being turned on on a line with the lower tank. ln this case the 'fluid trom -the higher tank backing up in the pipes ot' the lower tank raises the ball valve on the lower tank ott or` its seat, but presses against the [lap valve on the lower tank, and prevents the tluid t'rom backing up into and overflowing such lower tank, as clearly indicated in` Fig. 1.

The proportions between the tiap valve and the ball 'valve and their relative arrangement may be and preferably are such that when the flap valve is opened by the passing fluidA and has pushed the ball valve ln' the horizontal pipe,

from itsl Seat', x@aid tlap valve will prevent the ball valve troni retnriiing to itseat vvl-iile the thiidv is lowing. p p

lt will he Seen-that Shonldf a; tank on va low level he opened to discharge 'itsflhiid and one on a higher'level he Sin'ni'ltaneonslyj opened, the aet'ioiro'l the third frein :thee

higher tank will elose the cheek valve in the lower tank and prevent ib from,overlloivii'ig lThe invention yisnynet liinfited to the pro` vision ot' theindependent.:Seats for-the lap valve and the hall valve, or the eonstrnetion deserihed, whiehgis preferred. It. is eeseir, tial, however, that'y the flap yvalve and the ball valve shouldbe arranged substantially at. right angles in order to operate tno the liest. advantage.y l

lVhat I elaiin iSI-v i i 1. Aveoinbination linid andvaennin cheek,

eoinpi'ising a. tee having a Seat and a flap valve thereon,` and another seatand a ball valve therefor, the seatsl for the flap valve and the ball valvebeing arranged substantially at right, angles, andthe flap valve when ander pressure serving to force the hall valve otl' of its seat.

2. ln a combined fluid and vaeninn cheek, a't'ee, a plnfr for closing one end, a pipe inserted in the other end and provided with a reained-ont;end, a Wedge-shaped valve seat wedged in said reainedfont end el' the pipe,

a flap 'alve thereon, and a pipe inserted in the intermediate portion of the tee, a wedgeshaped valve. Seat, wedged in said pipe and a hall valve for said last'l mentioned seat), the klap valve and the bal'l valve seats arrz'inged at Substantially right. aiigleS in said tee '53. ln eoinl'iination with tanks arranged at 'dillerent altitndesg" a inain pipe line, een* A'neetioiia between Said tanks and said pipe line, and a eonibinecl hiid and vaeinnn eheek valve interposed in each tank connection 'and comprising' a hall valve and a flapk valve having Seatfs'yar'ranged ab Substantially righta/ngles, the combination being Sneh that when the elieek. valve ofthe higher tank is opened tortheoiittlow :of the, fluid frein the tank, the ball valve' offthe Acheek vfal've in the lower tank will be automaticall).v unseated and the ia'pvalve Closed against the eseapejoftlie fluid from Said lowler tank.

4. rlhe eonihination with a tank and a pipe line, of a easing, a flap valve Serving' as a thiid cheek, and a hall valve operating` as a vaeinnn Cheek, Said 'valves heinel arranged to Seat at right angles to one another in said easing` and working' in eonjnnetion with eaeh other, the combination heine Snell that so long' as' there is tlnid passing the valves frein the tank, the open ilnid eheek holds 

